写的一个简简单单的php数据库调用类和调用例子.

<?php
class C_MySQL{
	var $link_id;  
	var $result;
	
	public function __construct() {
		$test=true;
		if($test)
		{
			$host="127.0.0.1";
			$name="root";
			$pass="root";
			$db="wxads";
			$code="utf-8";
		}
		else
		{
			$host="114.215.110.13";
			$name="root";
			$pass="XXXXXX";
			$db="wxtest";
		}
		define("CLIENT_MULTI_RESULTS", 131072);
		$conn = mysql_connect ($host,$name,$pass,1,CLIENT_MULTI_RESULTS) or die ( "连接失败" );  
		mysql_select_db ($db, $conn );
		mysql_query ( "SET NAMES "".$code.""", $conn);  
		$this->link_id = $conn; 
	}  
	function __destruct ()
	{
		mysql_close($this->link_id);
	}
	private function fetcharray() {  
		$data = array ();  
		while ( $row = mysql_fetch_array ( $this->result ) )
		{  
			array_push ( $data, $row );  
		}
		mysql_free_result ( $this->result );  
		return $data;  
	}  
	public function EXE_select($sql) { 
		$this->result = mysql_query ( $sql, $this->link_id ); 
		if($this->result)
			return $this->fetcharray();
		else
			return mysql_error();
	}
	public function EXE_delete($sql) {
			return $this->EXE_update($sql);
	}
	public function EXE_update($sql) { 
		$tmp=mysql_query ( $sql, $this->link_id );
		if($tmp)
			return mysql_affected_rows($this->link_id);
		else
			return mysql_error();
	}
	public function EXE_insert($sql) { 
		$tmp=mysql_query ( $sql, $this->link_id );
		if($tmp)
			return mysql_insert_id($this->link_id);
		else
			return mysql_error();
	}   
} 
function D($sql)
{
	$db=new C_MySQL();
	switch(strtolower(substr($sql,0,6)))
	{
		case "select":
			return $res=$db->EXE_select($sql);
		break;
		case "delete":
			return $res=$db->EXE_delete($sql);
		break;
		case "update":
			return $res=$db->EXE_update($sql);
		break;
		case "insert":
			return $res=$db->EXE_insert($sql);
		break;
	}
	
}



$sql="delete from  `user` where WX_ID="XXXXXXXXXXXXXX"";
$res=D($sql);
echo ($res);

?>